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selinux: reduce the number of calls to synchronize_net() when flushing caches 

When flushing the AVC, such as during a policy load, the various
network caches are also flushed, with each making a call to
synchronize_net() which has shown to be expensive in some cases.
This patch consolidates the network cache flushes into a single AVC
callback which only calls synchronize_net() once for each AVC cache
flush.

Reported-by: Jaejyn Shin <flagon22bass@gmail.com>
Signed-off-by: Paul Moore <pmoore@redhat.com>
This commit is contained in:
Paul Moore 2014-06-26 14:33:56 -04:00
parent f31e799459
commit 615e51fdda
7 changed files with 23 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
security/selinux/hooks.c
View File

@ -161,6 +161,17 @@ static int selinux_peerlbl_enabled(void)
return (selinux_policycap_alwaysnetwork || netlbl_enabled() || selinux_xfrm_enabled());
}
static int selinux_netcache_avc_callback(u32 event)
{
if (event == AVC_CALLBACK_RESET) {
sel_netif_flush();
sel_netnode_flush();
sel_netport_flush();
synchronize_net();
}
return 0;
}
/*
* initialise the security for the init task
*/
@ -5993,6 +6004,9 @@ static __init int selinux_init(void)
if (register_security(&selinux_ops))
panic("SELinux: Unable to register with kernel.\n");
if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET))
panic("SELinux: Unable to register AVC netcache callback\n");
if (selinux_enforcing)
printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n");
else

2
security/selinux/include/netif.h
View File

@ -17,6 +17,8 @@
#ifndef _SELINUX_NETIF_H_
#define _SELINUX_NETIF_H_
void sel_netif_flush(void);
int sel_netif_sid(int ifindex, u32 *sid);
#endif /* _SELINUX_NETIF_H_ */

2
security/selinux/include/netnode.h
View File

@ -27,6 +27,8 @@
#ifndef _SELINUX_NETNODE_H
#define _SELINUX_NETNODE_H
void sel_netnode_flush(void);
int sel_netnode_sid(void *addr, u16 family, u32 *sid);
#endif

2
security/selinux/include/netport.h
View File

@ -26,6 +26,8 @@
#ifndef _SELINUX_NETPORT_H
#define _SELINUX_NETPORT_H
void sel_netport_flush(void);
int sel_netport_sid(u8 protocol, u16 pnum, u32 *sid);
#endif

15
security/selinux/netif.c
View File

@ -240,7 +240,7 @@ static void sel_netif_kill(int ifindex)
* Remove all entries from the network interface table.
*
*/
static void sel_netif_flush(void)
void sel_netif_flush(void)
{
int idx;
struct sel_netif *netif;
@ -252,15 +252,6 @@ static void sel_netif_flush(void)
spin_unlock_bh(&sel_netif_lock);
}
static int sel_netif_avc_callback(u32 event)
{
if (event == AVC_CALLBACK_RESET) {
sel_netif_flush();
synchronize_net();
}
return 0;
}
static int sel_netif_netdev_notifier_handler(struct notifier_block *this,
unsigned long event, void *ptr)
{
@ -291,10 +282,6 @@ static __init int sel_netif_init(void)
register_netdevice_notifier(&sel_netif_netdev_notifier);
err = avc_add_callback(sel_netif_avc_callback, AVC_CALLBACK_RESET);
if (err)
panic("avc_add_callback() failed, error %d\n", err);
return err;
}

15
security/selinux/netnode.c
View File

@ -283,7 +283,7 @@ int sel_netnode_sid(void *addr, u16 family, u32 *sid)
* Remove all entries from the network address table.
*
*/
static void sel_netnode_flush(void)
void sel_netnode_flush(void)
{
unsigned int idx;
struct sel_netnode *node, *node_tmp;
@ -300,15 +300,6 @@ static void sel_netnode_flush(void)
spin_unlock_bh(&sel_netnode_lock);
}
static int sel_netnode_avc_callback(u32 event)
{
if (event == AVC_CALLBACK_RESET) {
sel_netnode_flush();
synchronize_net();
}
return 0;
}
static __init int sel_netnode_init(void)
{
int iter;
@ -322,10 +313,6 @@ static __init int sel_netnode_init(void)
sel_netnode_hash[iter].size = 0;
}
ret = avc_add_callback(sel_netnode_avc_callback, AVC_CALLBACK_RESET);
if (ret != 0)
panic("avc_add_callback() failed, error %d\n", ret);
return ret;
}

15
security/selinux/netport.c
View File

@ -217,7 +217,7 @@ int sel_netport_sid(u8 protocol, u16 pnum, u32 *sid)
* Remove all entries from the network address table.
*
*/
static void sel_netport_flush(void)
void sel_netport_flush(void)
{
unsigned int idx;
struct sel_netport *port, *port_tmp;
@ -234,15 +234,6 @@ static void sel_netport_flush(void)
spin_unlock_bh(&sel_netport_lock);
}
static int sel_netport_avc_callback(u32 event)
{
if (event == AVC_CALLBACK_RESET) {
sel_netport_flush();
synchronize_net();
}
return 0;
}
static __init int sel_netport_init(void)
{
int iter;
@ -256,10 +247,6 @@ static __init int sel_netport_init(void)
sel_netport_hash[iter].size = 0;
}
ret = avc_add_callback(sel_netport_avc_callback, AVC_CALLBACK_RESET);
if (ret != 0)
panic("avc_add_callback() failed, error %d\n", ret);
return ret;
}